Stocks open mostly lower as investors fret over trade issues

U.S. stocks opened mostly lower on Thursday, as ongoing uncertainty surrounding trade policy weighed on investor sentiment. The S&P 500
SPX, +0.01%
was flat at the open at 2,700. The Dow Jones Industrial Average
DJIA, +0.35%
fell 38 points, or 0.2%, to 24,084. The Nasdaq Composite Index
COMP, +0.45%
declined 8 points, or 0.1%, to 7,436 at the open. Among the biggest losers on the S&P 500, shares of Walgreens Boots Alliance Inc
WBA, -0.97%
and CVS Health Corp
CVS, -1.60%
dropped nearly 10% after Amazon.com
AMZN, +2.01%
announced that it has agreed to acquire PillPack, an online pharmacy that pre-sorts medications into different doses and handles both refills and renewals.

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